Update Flash. Again.
Yes, any random web site can completely take over your computer, steal your lunch and piss on your rug unless you update.
Yes, even if you have a Mac.
Yes, even if you have Linux.
Yes, even your phone. Yes your tablet. Yes your smart watch. Yes your goddamn car, your insulin pump, or whatever other thing some idiot decided needs to work with the post-Mosaic pre-HTML5 Web.
No, this is not the same security hole from last month or whatever: this is another one.
Yes, there will be another one after that, and another one, and another one, because Adobe is circling the drain [it's a veeeeeeeeeeeeery slow drain].
Yes, you should just uninstall Flash, even if it breaks YouTube and shit. But you're not going to, are you? So go update that shit again and set it to auto-update.